Prima PH-42T7

[pelota]

I recently got a Prima PH-42T7 plasma TV, which has a Samsung S42AX-Y001 panel. This thing powers on and you get a picture but you get horizontal black and red lines over the screen except for the bottom 2 inches. I assume this means the Y-Buffers are going? I can get another Tv of this model that powers on but with no picture, from do some reading I assume this might need a Y-Sustain board. Now for the question. If both assumptions are correct. What would be the odds of getting a good set of buffers out of the second TV. Or if the Y-Sustain goes how often does it take the buffer boards with it?

[PlainBill]

Re: Prima PH-42T7

I recently got a Prima PH-42T7 plasma TV, which has a Samsung S42AX-Y001 panel. This thing powers on and you get a picture but you get horizontal black and red lines over the screen except for the bottom 2 inches. I assume this means the Y-Buffers are going? I can get another Tv of this model that powers on but with no picture, from do some reading I assume this might need a Y-Sustain board. Now for the question. If both assumptions are correct. What would be the odds of getting a good set of buffers out of the second TV. Or if the Y-Sustain goes how often does it take the buffer boards with it?

I'd say the chances are slim. One common failure sequence is a buffer shorts, taking out the Y-Sustain. Check out the first March post in this blog.

Depending on the cost of the second set, it would be instructive to swap the Y-Sustain and Y buffers between sets (do this as a unit).

PlainBill

[xDonny]

Re: Prima PH-42T7

hey i have the same problem, i was looking around and saw that it was a problem with a buffer board or something? is there a way to fix this on a budget? I just got this tv for free and would like it for my bedroom

[xDonny]

Re: Prima PH-42T7

why is it that people just replace the sustain boards? can you not fix it?

[xDonny]

Re: Prima PH-42T7

alright so i think i mega-frigged it up, when i got this tv i had to replace a fuse that somebody took out, so i tried to replace another and the one i put in it was a 36v by accident and it blew the fuse, and now it only turns on for a second or two then turns off, i'm leaving it unplugged overnight because i remember hearing something about leaving it to discharge but anyway, if anybody has any idea how i can fix this without buying the stupid $200 boards in the back tell me

[PlainBill]

Re: Prima PH-42T7

alright so i think i mega-frigged it up, when i got this tv i had to replace a fuse that somebody took out, so i tried to replace another and the one i put in it was a 36v by accident and it blew the fuse, and now it only turns on for a second or two then turns off, i'm leaving it unplugged overnight because i remember hearing something about leaving it to discharge but anyway, if anybody has any idea how i can fix this without buying the stupid $200 boards in the back tell me

You don't have to buy new boards. There are a number of firms that rebuild them. Here are the economics: A buffer contains 6 chips that cost $8- $10 each. These ICs have over 100 pins so removing the old and installing the new is very delicate. In general, the rebuilder will replace all ICs. Rebuilding each buffer costs $80 - $90. If a buffer shorts it usually shorts a transistor on the Y-Sustain board. That transistor is relatively inexpensive (under $10), but requires a hot air system to remove it. Sometimes the hybrid shorts. The hybrid costs $40, and is tricky to replace. The going rate for a rebuild of all boards is $250.

PlainBill

[xDonny]

Re: Prima PH-42T7

I havn't got that kind of money

[PlainBill]

Re: Prima PH-42T7

I havn't got that kind of money

And if you had that kind of money I would have recommended that you NOT use it to repair this TV. New 42" plasma TVs are selling for $400-$450. Used 42" Plasmas are going for under $300.

PlainBill

[xDonny]

Re: Prima PH-42T7

I want to fix this on my own, if i post pictures of the boards can you circle the bits that need replacing? i can use a heat gun to replace them

[pelota]

Re: Prima PH-42T7

Thought I would report back on the results. Bought a set of "New" buffers from some guy in China, kinda cheap. Arrived and actually looked new. Installed been running fine about 4 months

[ronklo]

Re: Prima PH-42T7

Thought I would report back on the results. Bought a set of "New" buffers from some guy in China, kinda cheap. Arrived and actually looked new. Installed been running fine about 4 months

Can you share where you got the boards from? I have 2 of these TV's that turn on & off, but no picture or sound, but do pass a picture from Cable or AV input, through to the AV output (but no sound). I've just started tinkering with TV's but in electronics for 30 so hoping repair shouldn't be too tough.

[CoppellTVRepair]

Re: Prima PH-42T7

Can you share where you got the boards from? I have 2 of these TV's that turn on & off, but no picture or sound, but do pass a picture from Cable or AV input, through to the AV output (but no sound). I've just started tinkering with TV's but in electronics for 30 so hoping repair shouldn't be too tough.

Just a word of caution:
http://blog.coppelltvrepair.com/2012...upper-and.html

Just for the record a pair of *new* buffers , meaning brand new, SAMSUNG OEM with the 4 ICs (manufactured on or after 2010) is $130.

Of course that can always change, but it's been somewhat reliably holding for the past year or two.

We and others occasionally sell used 6-IC buffers on eBay; they go usually below $40 a piece, in fact the last time I think one of them sold for about $12 or so.

I am not recommending avoiding China in general - after all that's where most of what's in the official US stores comes from - but you should definitely think twice about this particular set of boards.